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(.module:
[lux #*
["_" test (#+ Test)]
[abstract
[equivalence (#+)]
[hash (#+ Hash)]
[monad (#+ do)]
{[0 #spec]
[/
["$." functor (#+ Injection Comparison)]
["$." apply]
["$." monad]]}]
[control
[security
["!" capability]]]
[data
["." name]
["." text ("#@." equivalence)]
[number
["n" nat]]]
[math
["r" random]]]
{1
["." / (#+ Context Privacy Can-Conceal Can-Reveal Privilege Private with-policy)]})
(def: (injection can-conceal)
(All [label]
(-> (Can-Conceal label) (Injection (All [value] (Private value label)))))
(!.use can-conceal))
(def: (comparison can-reveal)
(All [label]
(-> (Can-Reveal label) (Comparison (All [value] (Private value label)))))
(function (_ == left right)
(== (!.use can-reveal left)
(!.use can-reveal right))))
(type: Password (Private Text))
(signature: (Policy %)
(: (Hash (Password %))
&hash)
(: (-> Text (Password %))
password)
(: (Privilege Privacy %)
privilege))
(def: (policy _)
(Ex [%] (-> Any (Policy %)))
(with-policy
(: (Context Privacy Policy)
(function (_ (^@ privilege (^open "%@.")))
(structure
(def: &hash
(structure
(def: &equivalence
(structure (def: (= reference sample)
(text@= (!.use %@can-downgrade reference)
(!.use %@can-downgrade sample)))))
(def: hash
(|>> (!.use %@can-downgrade)
(:: text.hash hash)))))
(def: password
(!.use %@can-upgrade))
(def: privilege
privilege))))))
(def: #export test
Test
(<| (_.context (name.module (name-of /._)))
(do r.monad
[#let [policy-0 (policy [])]
raw-password (r.ascii 10)
#let [password (:: policy-0 password raw-password)]]
($_ _.and
($functor.spec (..injection (:: policy-0 can-upgrade)) (..comparison (:: policy-0 can-downgrade)) /.functor)
($apply.spec (..injection (:: policy-0 can-upgrade)) (..comparison (:: policy-0 can-downgrade)) /.apply)
($monad.spec (..injection (:: policy-0 can-upgrade)) (..comparison (:: policy-0 can-downgrade)) /.monad)
(_.test "Can work with private values under the same label."
(and (:: policy-0 = password password)
(n.= (:: text.hash hash raw-password)
(:: policy-0 hash password))))
(let [policy-1 (policy [])
delegate (/.delegation (:: policy-0 can-downgrade) (:: policy-1 can-upgrade))]
(_.test "Can use delegation to share private values between policies."
(:: policy-1 = (delegate password) (delegate password))))
))))
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